Door check



Aug. 4, 1936.

E. ROGNEBAKKE DOOR CHECK Filed June l0, y1935 INVENTOR ATTORNEY Patented Aug. 4, 1936 UNITED STATES PATENT OFFICE Application `June 10,

Claims.

This invention relates to door checks and has for an object to provide a door check including a novel chain and a spring pressed bolt associated with the chain for holding the door stationary in 5 any open position.

A further object is to provide a door check in which the chain will include novel links having stop shoulders to limit flexing of the chain in either direction, and also having heads on the pivots of the links to be yieldingly engaged by the latching bolt.

A further object is to provide a door check having a novel latching bolt and novel cam accessible from the exterior of the door frame to hold the bolt in released position so that the door may be unobstructed during opening or closing movement.

A still further object is to provide a door check which will be formed of a few, simple, durable and inexpensive parts, which will be easy to manufacture, and which will not easily get out of order. Y

With the above and other objects in view the invention consists of certain novel details of construction and combinations of parts hereinafter fully described and claimed, it being understood that various modifications may be resorted to within the scope of the appended claims Without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawing forming part of this specification,-

Figure 1 is a longitudinal sectional view showing the door check constructed in accordance with the invention in applied position.

Figure 2 is a cross sectional view taken on the line 2-2 of Figure l.

Figure 3 is a fragmentary elevation showing the bolt releasing cam mechanism.

Figure 4 is a plan view of the chain in the arcuate position assumed when the door is fully open.

Figure 5 is a side elevation of a pair of adjoining links of the chain.

Figure 6 is a longitudinal sectional View taken on the line 6-6 of Figure 5.

Referring now to the drawing in which like characters of reference designate similar parts in the various views, I9 designates a door adapted to be pivotally supported upon a door frame II by hinges I2 as best shown in Figure 3. In carrying out the invention I provide a link chain I3 which is mounted to slide in and out of a housing I4 -disposed in a suitable recess I5 in the door 55 frame, the terminal link I6 at one end of the 1935, serial No. 25,866

chain being provided with a lug I'I which passes through a slot I8 formed in a face plate I9 secured to the hinged edge of the door by screws 29, and is locked to the face plate by a pin 2| passed through an opening 22 in the lug. Thus the chain will be slit out of and into the housing I4 when the door is opened or closed.

The chain comprises a plurality of links 23 pivotally connected together by pins 24. Each pivot pin is headed up as shown at 25 at one end 29 of the next contiguous link. The shoulders L 3| and 32 on one side of the longitudinal center line of adjoining links are formed so that play will exist to permit liexing of the chain to 180 and this may be done by bevelling the shoulder 32. 'I'he shoulders 33 and 34- on the opposite side of the longitudinal center line of adjoining links are squared shoulders so that flexing will be prevented beyond a rectilinear line. Thus the chain may flex to'arcuate form as shown by Figure 4 when the door opens, but when the door begins to close the chain-will not flex beyond a straight line so that it will always slide into the housing I4 in straight condition.

The housing I4 is provided With a lateral branch 35 having an integral face plate 36 which is secured to the door frame by screws 31. A latching bolt 38 is slidably fitted in openings formed in spaced webs 39 and 40 formed in the lateral branch of the housing. A helical spring 4I surrounds the stem of the bolt between the webs and urges the bolt toward the chain. The bolt is provided with an enlarged head 42 which is substantially square in cross section, as best shown in Figure 2, and is provided in the outer face with a V-shaped notch 43 adapted to engage the correspondingly shaped heads 26 of the pivots of the link chain and yieldingly hold the chain stationary so that the door will be held stationary at any partly open position. The outer face of the bolt head is bevelled as shown at 44 on opposite sides of the notch to permit the bolthead riding over the pivot pin heads 26 in either direction as the door is opened or closed.

For holding the bolt withdrawn to released position a cam 45 is mounted in a recess 46 formed in the stem of the locking bolt, the high side of the cam engaging the end wall 41 of the recess when the cam is turned axially in one direction and holding the bolt out of the path of the chain so that the door may be opened or closed Without obstruction or check. The cam is provided with a shaft 48 which is turnably mounted in a depressed seat 49 formed in the face plate 36. The shaft is equipped with a key handle 50 accessible from the exterior of the face plate for turning the cam to operative or released position. The cam is secured to the shaft by means of a pin 5l which is readily accessible for repairs by removing the cover plate 52 which is secured to the housing and lateral branch thereof by screws 53.

The chain it will be pointed out maybe turned end for end and secured to a door which opens in the opposite direction from the door shown in Figure l, since the pin 2l is interchangeably received in the opening 22 of the terminal link at either end of the chain. In either case the chain will be limited in its flexing movement between the straight position shown in Figure 2 and the curved position shown in Figure 4 in the operations of closing and opening the door.

From the above description it is thought that the construction and operation of my invention will be fully understood Without further explanation.

What is claimed is:

l. In a door check, a link chain connected at one end to the door, a housing for the chain in the door frame, spaced projections on the links of the chain, and a spring pressed bolt carried by the door frame and adapted to engage said projections and latch the chain stationary.

2. In a door check, a chain having links provided with shoulders limiting flexing movement of the chain, a housing for the chain in the door frame, said housing having a lateral branch, and a spring pressed bolt in said lateral branch adapted to intercept the chain and latch the chain stationary.

3. In a door check, a chain, pivots pivotally connecting the links together, angular heads on the pivots of the links, means connecting one end of the chain to the door, a. housing for the chain in the door frame, said housinghaving a lateral branch, a spring pressed bolt in said branch adapted to yieldingly engage said angular heads to latch the chain stationary, and means accessible externally of said branch for holding the bolt in released position.

4. In a door check, a plurality of connected intertting links, shoulders on the links for limiting the angle through which said links may be flexed in both directions, means for connecting one of the links to a door, a housing for mounting the links in a door casing, said housing having a lateral branch, a spring pressed latching bolt in said housing adapted to intercept said links, and intertting connections between the links and the bolt for latching the links stationary to hold the door stationary in any open position,

5. In a door check, a chain connected to the door, a housing in the door frame, said chain being slid by the door into and out of the housing, spaced projections on said chain, a spring pressed bolt carried. by the door frame and adapted to yieldingly engage said projections and latch the chain stationary, and a manually operable cam carried by the door frame and adapted to hold said bolt disengaged from said chain.

EINAR ROGNEBAKKE. 

